Siemens, Yellow, Rotate-To-Unlatch 40mm Round Head Emergency Button. Mounting Type: Panel Mount. Normal State Configuration: 1NO/2NC. Cutout Diameter: 22mm. Auxiliary Contacts: 3. Supply Current: 10 A. IP Rating: IP66, IP67, IP69, IP69K. Push Button Actuation: Latching. Supply Voltage: 500 V ac/dc. Depth: 89.4mm. Dimensions: 85 x 112.5 x 89.4 mm. Push Button Material: Plastic. MPN: 3SU1851-0ND00-2AC2